What are the types of transmission line ?

What are the Types of Transmission Line ?

There are 3 types of transmission line:

Short Transmission Line

Medium Transmission Line

Long Transmission Line

Short Transmission Line

A transmission line having its length under 80 kilometer is taken into account as a short transmission line. In short transmission line capacitance is neglected due to little leak current and alternative parameters (resistance and inductance) ar lumped within the transmission line.

For a medium transmission line, charging current is substantial and due to the length of the line the shunt admittance plays a significant role in the calculation of the effective parameters of the line.

The shunt admittance and series impedance are considered as a lumped parameter of the medium transmission line. The medium transmission line is shown below in the diagram.

Many localized capacitance models have been used to make approximate line performance calculations. The following models are commonly used.

Nominal T model

Nominal ∏ (pi) model

Long Transmission Line

A power transmission line with its effective length of around 250 Kms or higher than is stated as an extended transmission line. The line constants area unit uniformly distributed over the whole length of line.

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